Electric heater.



i No. 761,250. PATENTED MAY 31, 1904. E. P. PORTER.

ELECTRIC HEATER. AYPLIOATION FILED 0OT.17, 1898.

N0 IODEL.

UNITED STATES y Patented May 3`1, 1904.

PATENT OFFICE.

EDWIN F. PORTER, OF BOSTON, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS, TO BENJAMIN F. PEACH, OF LYNN, MASSACHUSETTS.

ELECTRIC HEATER.

SPECIFICATION forming part of Letters Patent No. 761,250, dated May 31, 1904.

Application filed October 17, 1898.

1'0 (LZZ whom, t may concern:

Be it known that I, EDWIN F. PORTER, of Boston, in the countyof Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Electric Heaters, of which the following is a specification.

' My invention relates to electricy heating apparatus and is in the nature of an improvement on the electric heating apparatus shown in the patent to Mark W. Dewey, N o. 449,404,

-dated March 3l, 1891. I

' the entire apparatus, both motor and heater,

becomes inoperative. In actual practice with fan-heaters one requirement and advantage is that the heating-wires are kept down to a low temperature by the rapid iiow of the air from the fan, and it has been necessary to caution those who use fan-heaters to turn off the heat before stopping the fan, or in cases of accident the motor-circuit may become disconnected, leaving the heater in operation, and too high a temperature would be produced, endangering the heater and sacrificing one of the great advantages of circulating the air freely over the heating-surfaces which is realized in a fan-heater over the ordinary stationary electric heater. By the arrangement disclosed it will be seen that it is impossible to run the heater without running the fan at the same time, therefore rendering it impossible to raise the temperature of the Wires to too high a degree with the danger of burning out the same, and when it is necessary to start the apparatus but one circuit is used for the purpose, and the heater and fan by the throw of this one switch are started and stopped simultaneously. In this apparatus the heating Serial No. 693,714.- (No model.)

resistance takes the place of the ohmic'resistance obtained in the usual motor by numerous ampere-windings of the armature and field, as the current passing through the heater is cut down to the proper amperage for the requisite heat and is passed through a few windings in the motor just sufficient to give the proper magnetic force for running the fan. By this arrangement it will be seen that the motor may be made very much smaller and lighter and at a much reduced cost from the commercial motors on the market running on a high voltage-for instance, one hundred and ten volts. The motors used commercially on this voltage Weigh about twenty or twenty-five pounds. This weight seems to be a necessary feature of these motors in order to get a sufficient amount of wire in the windings, which amount, as has been above stated, is greatly reduced by including the necessary ohmic resistance in the heater itself. By this construction it is found in practice that the motor may be made of one-quarter the size and weight and proportionally less in cost than the motors now in commercial use on one-hundred-and-ten-volts circuitfor thereabout.

My invention consists of certain novel features hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which illustrate a construction embodying my invention, Figure 1 is a plan View of an electricallyheated fan and motor in series. Figs. 2 and 3 represent, respectively, a front and perspective view of the same. S 5

Like letters of reference refer to like parts throughout the several views.

A represents an electric motor of any desired construction, provided with a base B, by which it is secured in place. The shaft C, operated by said motor, carries on its end the fan D, fast thereon, so as to revolve therewith, and said fan consists of a series of blades D'.

E represents an electric conductor through 95 which the current passes from a suitable source of electricity to the brush F and from said brush F to the c'ollector-ringlG, fast on the shaft C and insulated therefrom. The current then passes from said ring G through the wire H, which is Wrapped around each of the blades of the fan, to form on each of the blades the re- 5 sistances J for heating,and the end of said wire,

I 5 passes oi by means of the conductor Q, secured to said binding-post.

It is obvious from the above description that duringall the time the circuit is through the motor the current is passing through the heater, so-that the heater is constantly in series with the motor while the circuit is closed through the motor.

Y do not limit myself to the arrangement and construction shown, as the same may be variedwithout-'departing vfrom the spirit of my invention. c

.Having thus ascertained thenature of my invention and s'etorthaconstruction embodying the same, what I claim as new, and desire 3 to secure Aby Letters Patent of the United States,is-`

1. In an apparatus of the character specified, one or more heat-developing electric conductors forming an electric heater, movable v means'as a fan `for removing or displacing the heat from said heater, a motor for operating said movable 4means and oieringless resistance to the. current than the heater, and an electricconduetor continuously in series with 4 both heater-and motor While the circuit is closedthrough the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistanceto the electric current while the circuit is closedthrough the motor.

2. In an apparatus of the character specified, a fan, one or more heat-developing electric conductors forming an electric heater and mounted on said fan, a motor for operating the fan and 'offering less resistance to the current than the heater, and an electric conductor continuously in series with both heater andmotor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric current while the circuit is closed through the motor.

3. In an apparatus of the character specitied, one or more heat-developing electric conductors forming an electric heater, a fan mounted on the same support as the heater for removing or displacing the heat from said heater, a motor. for operating said fanv and oii'ering less resistance to the current than the heater, and an electric conductor continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric current while the circuit is closed through the motor.

4. In an apparatus of the character specified, a movable electric heater consistingr of one or more heat-developing electric conductors, a motor for moving said heater to rcmove or displace the heated air therefrom and offering less resistance to thc current than the heater, and an electric conductor continuously in Series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric currentI while the circuit is closed through the motor.

5. In an apparatus of the character specitied, a fan, one or more heat-developing electric conductors forming an electric heater and mounted on the blades of said fan, a motor for operating said fan for removing lor displacing the heated air from said heater and oiering less resistance to the current than the heater, and an electric conductor continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric current while the circuit is closed through the motor.

6. In an apparatus of the character specified, one or more heat-developing electric conductors forming an electric heater, a rotary fan for removing or displacing the heat from said heater, a motor for operating said rotary fan and oering less resistance to the current than the heater, and an electric conductor continuously in series with both heater and inotor while the circuit is closed through 4thc motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric current while the circuit is closed through the motor.

7. In an apparatus of the character described, one or more heat-developing electric conductors forming an electric heater, movable means as a fan for removing or displacing the heat from said heater, a motor for operating said movable means, and an electric circuit continuously in series with both heater and motor while the circuit is closed through the motor and adapted to energize both the heater and motor coincidentally, the said heater forming a permanent resistance to the electric current while the circuit is closed through the motor.

8. In an apparatus of the character described, one or more heat-developingelectric conductors forming an electric heater, a fan for removing or displacing the heat from said lIO heater, a motor for operating; said fan, and an In testimony whereof I have signed my name electric circuit continuously in series with to this specification, in the presence of two sub. IO both heater and motor While the circuit is scribing witnesses, this 13th day of October, closed through the motor and adapted to en- A. D. 1898.

ergze both heater and motor coincidentally, EDWIN F. PORTER. the said heater forming a permanent resist- VVitneSses: ance to the electric current while the circuit A. L. MESSER,

is closed through the motor. C. A. STEWART. 

